export declare const REALTIME_PROTOCOL_VERSION = 1;
export declare const REALTIME_SSE_HANDSHAKE_EVENT = "handshake";
export declare const REALTIME_SSE_TOKEN_EVENT = "token";
export declare const REALTIME_CAP_NO_AWARENESS = "no-awareness";
export declare const REALTIME_CAP_POLL_LIVE = "poll-live";
export declare const REALTIME_POLL_LIVE_QUERY_PARAM = "poll_live";
export interface RealtimeHandshake {
    protocol: number;
    capabilities: string[];
}
export interface RealtimeTokenFrame {
    token: string;
    expiresAt?: string;
}
export declare function buildHandshakeFrame(capabilities?: readonly string[]): RealtimeHandshake;
export declare function parseHandshakeFrame(data: string): RealtimeHandshake | null;
export declare function parseTokenFrame(data: string): RealtimeTokenFrame | null;